[M4M] [Group] Need help making a gay fantasy story

I have been thinking about making a playful gay fantasy story that revolves around the basic concept shown in the comic I made in the link below. I had a story ideal that some geeks in high school made a size ray gun for a science project with different settings like (full or part) or for use on people settings like (full body or body part) and some other student sneaks into the room while no one is there and uses it to make his package bigger. Eventually other guys also do it together (Gay guys) with different end results before the ray gun is moved so they can’t use it anymore. I had the ideal that maybe the ray gun is so big that there needs to one person to shoot it at the other person but I don’t know if it should work that way or not. Also I had the ideal that the ray gun was only a growth ray gun (so can’t shrink things back) and that it was at some student’s house and build by their father. My last ideal is that they discover the gun being stored in their locker room and start toying with it. I’m not sure what to do with the ideal. Please give all the advice or ideals you have. I like the ideal but I don’t know how it should go. https://imgur.com/a/KB8RZ

Source: reddit.com/r/eroticliterature/comments/72xgwv/m4m_group_need_help_making_a_gay_fantasy_story